Module with untyped function for exporting at the top level with characteristics

I am in the process of creating a typings file for a library called changeset within my project. This library has two main use cases:

import * as changeset from "changeset";

changeset({}, {}); // used as a function
changeset.applyChanges({}, {}); // calling a property on changeset

The actual function in changeset is named apply, not applyChanges. I made this adjustment to prevent confusion with JavaScript's built-in apply method.

To achieve this, I have created the following files: index.ts and changeset.d.ts

declare function changeset(objA: any, objB: any): any;
declare module "changeset" {
    export function applyChanges(changes: any, obj: any): any;
}

changeset.applyChanges(...) works correctly, but changeset(...) does not:

This expression is not callable.
  Type 'typeof import("changeset")' has no call signatures.

My .d.ts closely resembles TypeScript's recommended structure, except it lacks export = changeset; at the end. Adding this causes an error in the import statement of index.ts:

Could not find a declaration file for module 'changeset'.

From what I can gather, the difference lies in other .d.ts files being imported from node_modules, while this one is specific to my project.

Is there a way to properly include complex module declarations like this within a single project?


EDIT

Attempted a different approach:

declare module "changeset" {
    const changeset: {
        (objA: any, objB: any): any;
        applyChanges: (changes: any, obj: any) => any;
    };
    export = changeset;
}

Encountered the same issue as before: changeset.applyChanges(...) functions correctly, while changeset(...) does not...

Answer №1

It appears that your type is alright. However, if the changeset module includes a default export (the primary function with additional properties that are also functions), it would be best to import it in this manner:

import changeset from "changeset";

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